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a65a7e70 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* | |
17 | * author: M.Kalisky@gsi.de | |
18 | * 08/Dec/2010 | |
19 | * | |
20 | * Description: This class allows with purely kinematical cuts | |
21 | * to select clean samples of electrons, pions and protons from the | |
22 | * V0 online finder ESD V0 candidates for PID and dectector resonse | |
23 | * studies. | |
24 | */ | |
25 | ||
26 | #include <TVector3.h> | |
27 | #include <TDatabasePDG.h> | |
28 | ||
29 | #include "AliESDv0.h" | |
30 | #include "AliESDtrack.h" | |
31 | #include "AliESDEvent.h" | |
32 | #include "AliVEvent.h" | |
33 | #include "AliLog.h" | |
34 | #include "AliKFParticle.h" | |
35 | #include "AliVTrack.h" | |
36 | #include "AliKFVertex.h" | |
37 | ||
38 | #include "AliESDv0KineCuts.h" | |
39 | ||
40 | ClassImp(AliESDv0KineCuts) | |
41 | ||
42 | //____________________________________________________________________ | |
43 | AliESDv0KineCuts::AliESDv0KineCuts() : | |
44 | fEvent(0x0) | |
45 | , fPrimaryVertex(0x0) | |
46 | , fType(0) | |
47 | , fMode(0) | |
48 | , fTPCNcls(1) | |
49 | , fTPCrefit(kTRUE) | |
50 | , fTPCchi2perCls(4.0) | |
51 | , fTPCclsRatio(0.6) | |
52 | , fNoKinks(kTRUE) | |
53 | , fGcutChi2NDF(10) | |
54 | , fGcutInvMass(0.05) | |
55 | , fK0cutChi2NDF(10) | |
56 | , fLcutChi2NDF(10) | |
57 | , fUseExternalVertex(kFALSE) | |
58 | , fDeleteVertex(kFALSE) | |
59 | { | |
60 | // | |
61 | // Default constructor | |
62 | // | |
63 | ||
64 | // default single track cuts | |
65 | fTPCNcls = 1; // minimal number of the TPC clusters | |
66 | fTPCrefit = kTRUE; // TPC refit | |
67 | fTPCchi2perCls = 4.0; // chi2 per TPC cluster | |
68 | fTPCclsRatio = 0.6; // minimal foun/findable TPC cluster ratio | |
69 | fNoKinks = kTRUE; // kinks - no [kTRUE] or do not care [kFalse] | |
70 | ||
71 | ||
72 | // default gamma cuts values | |
73 | fGcutChi2NDF = 10; // Chi2NF cut value for the AliKFparticle gamma | |
74 | fGcutCosPoint[0] = 0; // cos of the pointing angle [min, max] | |
75 | fGcutCosPoint[1] = 0.02; // cos of the pointing angle [min, max] | |
76 | fGcutDCA[0] = 0.; // DCA between the daughter tracks [min, max] | |
77 | fGcutDCA[1] = 0.25; // DCA between the daughter tracks [min, max] | |
78 | fGcutVertexR[0] = 3.; // radius of the conversion point [min, max] | |
79 | fGcutVertexR[1] = 90.; // radius of the conversion point [min, max] | |
80 | fGcutPsiPair[0] = 0.; // value of the psi pair cut [min, max] | |
81 | fGcutPsiPair[1] = 0.05; // value of the psi pair cut [min, max] | |
82 | fGcutInvMass = 0.05; // upper value on the gamma invariant mass | |
83 | // default K0 cuts | |
84 | fK0cutChi2NDF = 10; // Chi2NF cut value for the AliKFparticle K0 | |
85 | fK0cutCosPoint[0] = 0.; // cos of the pointing angle [min, max] | |
86 | fK0cutCosPoint[1] = 0.02; // cos of the pointing angle [min, max] | |
87 | fK0cutDCA[0] = 0.; // DCA between the daughter tracks [min, max] | |
88 | fK0cutDCA[1] = 0.2; // DCA between the daughter tracks [min, max] | |
89 | fK0cutVertexR[0] = 2.0; // radius of the decay point [min, max] | |
90 | fK0cutVertexR[1] = 30.0; // radius of the decay point [min, max] | |
91 | fK0cutInvMass[0] = 0.486; // invariant mass window | |
92 | fK0cutInvMass[1] = 0.508; // invariant mass window | |
93 | // Lambda & anti-Lambda cut values | |
94 | fLcutChi2NDF = 10; // Chi2NF cut value for the AliKFparticle K0 | |
95 | fLcutCosPoint[0] = 0.; // cos of the pointing angle [min, max] | |
96 | fLcutCosPoint[1] = 0.02; // cos of the pointing angle [min, max] | |
97 | fLcutDCA[0] = 0.; // DCA between the daughter tracks [min, max] | |
98 | fLcutDCA[1] = 0.2; // DCA between the daughter tracks [min, max] | |
99 | fLcutVertexR[0] = 2.0; // radius of the decay point [min, max] | |
100 | fLcutVertexR[1] = 40.0; // radius of the decay point [min, max] | |
101 | fLcutInvMass[0] = 1.11; // invariant mass window | |
102 | fLcutInvMass[1] = 1.12; // invariant mass window | |
103 | ||
104 | } | |
105 | //____________________________________________________________________ | |
106 | AliESDv0KineCuts::~AliESDv0KineCuts(){ | |
107 | // | |
108 | // Destructor | |
109 | // | |
110 | ||
111 | ||
112 | } | |
113 | //____________________________________________________________________ | |
114 | AliESDv0KineCuts::AliESDv0KineCuts(const AliESDv0KineCuts &ref): | |
115 | TObject(ref) | |
116 | , fEvent(0x0) | |
117 | , fPrimaryVertex(0x0) | |
118 | , fType(0) | |
119 | , fMode(0) | |
120 | , fTPCNcls(1) | |
121 | , fTPCrefit(kTRUE) | |
122 | , fTPCchi2perCls(4.0) | |
123 | , fTPCclsRatio(0.6) | |
124 | , fNoKinks(kTRUE) | |
125 | , fGcutChi2NDF(10) | |
126 | , fGcutInvMass(0.05) | |
127 | , fK0cutChi2NDF(10) | |
128 | , fLcutChi2NDF(10) | |
129 | , fUseExternalVertex(kFALSE) | |
130 | , fDeleteVertex(kFALSE) | |
131 | { | |
132 | // | |
133 | // Copy operator | |
134 | // | |
135 | ||
136 | ref.Copy(*this); | |
137 | } | |
138 | //____________________________________________________________________ | |
139 | AliESDv0KineCuts &AliESDv0KineCuts::operator=(const AliESDv0KineCuts &ref){ | |
140 | // | |
141 | // assignment operator | |
142 | // | |
143 | if(this != &ref) | |
144 | ref.Copy(*this); | |
145 | return *this; | |
146 | } | |
147 | //____________________________________________________________________ | |
148 | void AliESDv0KineCuts::Copy(TObject &ref) const { | |
149 | // | |
150 | // Performs the copying of the object | |
151 | // | |
152 | ||
153 | TObject::Copy(ref); | |
154 | ||
155 | AliESDv0KineCuts &target = dynamic_cast<AliESDv0KineCuts &>(ref); | |
156 | ||
157 | // default single track cuts | |
158 | target.fTPCNcls = fTPCNcls; | |
159 | target.fTPCrefit = fTPCrefit; | |
160 | target.fTPCchi2perCls = fTPCchi2perCls; | |
161 | target.fTPCclsRatio = fTPCclsRatio; | |
162 | target.fNoKinks = fNoKinks; | |
163 | target.fUseExternalVertex = fUseExternalVertex; //added december 2nd 2011 | |
164 | target.fDeleteVertex = fDeleteVertex; //added december 2nd 2011 | |
165 | ||
166 | // default gamma cuts values | |
167 | target.fGcutChi2NDF = fGcutChi2NDF; | |
168 | memcpy(target.fGcutCosPoint, fGcutCosPoint, sizeof(Float_t) * 2); | |
169 | memcpy(target.fGcutDCA, fGcutDCA, sizeof(Float_t) * 2); | |
170 | memcpy(target.fGcutVertexR, fGcutVertexR, sizeof(Float_t) * 2); | |
171 | memcpy(target.fGcutPsiPair, fGcutPsiPair, sizeof(Float_t) * 2); | |
172 | target.fGcutInvMass = fGcutInvMass; | |
173 | // default K0 cuts | |
174 | target.fK0cutChi2NDF = fK0cutChi2NDF; | |
175 | memcpy(target.fK0cutCosPoint, fK0cutCosPoint, sizeof(Float_t) * 2); | |
176 | memcpy(target.fK0cutDCA, fK0cutDCA, sizeof(Float_t) * 2); | |
177 | memcpy(target.fK0cutVertexR, fK0cutVertexR, sizeof(Float_t) * 2); | |
178 | memcpy(target.fK0cutInvMass, fK0cutInvMass, sizeof(Float_t) * 2); | |
179 | // Lambda & anti-Lambda cut values | |
180 | target.fLcutChi2NDF = fLcutChi2NDF; | |
181 | memcpy(target.fLcutCosPoint, fLcutCosPoint, sizeof(Float_t) * 2); | |
182 | memcpy(target.fLcutDCA, fLcutDCA, sizeof(Float_t) * 2); | |
183 | memcpy(target.fLcutVertexR, fLcutVertexR, sizeof(Float_t) * 2); | |
184 | memcpy(target.fLcutInvMass, fLcutInvMass, sizeof(Float_t) * 2); | |
185 | ||
186 | } | |
187 | //____________________________________________________________________ | |
188 | Bool_t AliESDv0KineCuts::ProcessV0(AliESDv0* const v0, Int_t &pdgV0, Int_t &pdgP, Int_t &pdgN) const | |
189 | { | |
190 | // | |
191 | // main user function | |
192 | // | |
193 | ||
194 | if(!v0) return kFALSE; | |
195 | if(!fEvent){ | |
196 | AliErrorClass("No valid Event pointer available, provide it first"); | |
197 | return kFALSE; | |
198 | } | |
199 | ||
200 | if(!V0CutsCommon(v0)) return kFALSE; | |
201 | ||
202 | const Int_t id = PreselectV0(v0); | |
203 | ||
204 | if(!SingleTrackCuts(v0)) return kFALSE; | |
205 | ||
206 | switch(id){ | |
207 | case kUndef: | |
208 | return kFALSE; | |
209 | case kGamma: | |
210 | return CaseGamma(v0, pdgV0, pdgP, pdgN); | |
211 | case kK0: | |
212 | return CaseK0(v0, pdgV0, pdgP, pdgN); | |
213 | case kLambda: | |
214 | return CaseLambda(v0, pdgV0, pdgP, pdgN, 0); | |
215 | case kALambda: | |
216 | return CaseLambda(v0, pdgV0, pdgP, pdgN, 1); | |
217 | default: | |
218 | return kFALSE; | |
219 | } | |
220 | ||
221 | return kFALSE; | |
222 | } | |
223 | //____________________________________________________________________ | |
224 | Bool_t AliESDv0KineCuts::ProcessV0(AliESDv0* const v0, Int_t &pdgP, Int_t &pdgN) const | |
225 | { | |
226 | // | |
227 | // main user function, simplified if the V0 identity is not necessary | |
228 | // | |
229 | ||
230 | if(!v0) return kFALSE; | |
231 | if(!fEvent){ | |
232 | AliErrorClass("No valid Event pointer available, provide it first"); | |
233 | return kFALSE; | |
234 | } | |
235 | ||
236 | Int_t idV0 = -1; | |
237 | return ProcessV0(v0, idV0, pdgP, pdgN); | |
238 | ||
239 | } | |
240 | //____________________________________________________________________ | |
241 | Int_t AliESDv0KineCuts::PreselectV0(AliESDv0* const v0) const | |
242 | { | |
243 | // | |
244 | // Make a preselection (exclusive) of the V0 cadidates based on | |
245 | // Armenteros plot | |
246 | // the armenteros cut values are currently fixed and user is not able to set them via | |
247 | // set funcions. The reason is that these cuts are optimized and furneter changes should | |
248 | // not be necessary. To prove otherwise please study in detail before changing the values | |
249 | // | |
250 | ||
251 | Float_t ap[2] = {-1., -1.}; | |
252 | Armenteros(v0, ap); | |
253 | // for clarity | |
254 | const Float_t alpha = ap[0]; | |
255 | const Float_t qt = ap[1]; | |
256 | ||
257 | // selection cuts | |
258 | // - the reagions for different candidates must not overlap | |
259 | ||
260 | // Gamma cuts | |
261 | const Double_t cutAlphaG = 0.35; | |
262 | const Double_t cutQTG = 0.05; | |
263 | const Double_t cutAlphaG2[2] = {0.6, 0.8}; | |
264 | const Double_t cutQTG2 = 0.04; | |
265 | ||
266 | // K0 cuts | |
267 | const Float_t cutQTK0[2] = {0.1075, 0.215}; | |
268 | const Float_t cutAPK0[2] = {0.199, 0.8}; // parameters for curved QT cut | |
269 | ||
270 | // Lambda & A-Lambda cuts | |
271 | const Float_t cutQTL = 0.03; | |
272 | const Float_t cutAlphaL[2] = {0.35, 0.7}; | |
273 | const Float_t cutAlphaAL[2] = {-0.7, -0.35}; | |
274 | const Float_t cutAPL[3] = {0.107, -0.69, 0.5}; // parameters fir curved QT cut | |
275 | ||
276 | ||
277 | if(kPurity == fMode){ | |
278 | // Check for Gamma candidates | |
279 | if(qt < cutQTG){ | |
280 | if( (TMath::Abs(alpha) < cutAlphaG) ) return kGamma; | |
281 | } | |
282 | // additional region - should help high pT gammas | |
283 | if(qt < cutQTG2){ | |
284 | if( (TMath::Abs(alpha) > cutAlphaG2[0]) && (TMath::Abs(alpha) < cutAlphaG2[1]) ) return kGamma; | |
285 | } | |
286 | } | |
287 | if(kEffGamma == fMode){ | |
288 | if(qt < cutQTG) return kGamma; | |
289 | } | |
290 | ||
291 | ||
292 | // Check for K0 candidates | |
293 | Float_t q = cutAPK0[0] * TMath::Sqrt(TMath::Abs(1 - alpha*alpha/(cutAPK0[1]*cutAPK0[1]))); | |
294 | if( (qt > cutQTK0[0]) && (qt < cutQTK0[1]) && (qt > q) ){ | |
295 | return kK0; | |
296 | } | |
297 | ||
298 | // Check for Lambda candidates | |
299 | q = cutAPL[0] * TMath::Sqrt(TMath::Abs(1 - ( (alpha + cutAPL[1]) * (alpha + cutAPL[1]) ) / (cutAPL[2]*cutAPL[2]) )); | |
300 | if( (alpha > cutAlphaL[0]) && (alpha < cutAlphaL[1]) && (qt > cutQTL) && (qt < q) ){ | |
301 | return kLambda; | |
302 | } | |
303 | ||
304 | // Check for A-Lambda candidates | |
305 | q = cutAPL[0] * TMath::Sqrt(TMath::Abs(1 - ( (alpha - cutAPL[1]) * (alpha - cutAPL[1]) ) / (cutAPL[2]*cutAPL[2]) )); | |
306 | if( (alpha > cutAlphaAL[0]) && (alpha < cutAlphaAL[1]) && (qt > cutQTL) && (qt < q) ){ | |
307 | return kALambda; | |
308 | } | |
309 | ||
310 | return kUndef; | |
311 | } | |
312 | //____________________________________________________________________ | |
313 | Bool_t AliESDv0KineCuts::SingleTrackCuts(AliESDv0 * const v0) const | |
314 | { | |
315 | // | |
316 | // apply single track cuts | |
317 | // correct sign not relevat here | |
318 | // | |
319 | ||
320 | if(!v0) return kFALSE; | |
321 | ||
322 | Int_t pIndex = 0, nIndex = 0; | |
323 | pIndex = v0->GetPindex(); | |
324 | nIndex = v0->GetNindex(); | |
325 | AliESDtrack* d[2]; | |
326 | d[0] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(pIndex)); | |
327 | d[1] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(nIndex)); | |
328 | ||
329 | for(Int_t i=0; i<2; ++i){ | |
330 | if(!d[i]) return kFALSE; | |
331 | ||
332 | // status word | |
333 | ULong_t status = d[i]->GetStatus(); | |
334 | ||
335 | // No. of TPC clusters leave to the users | |
336 | if(d[i]->GetTPCNcls() < 1) return kFALSE; | |
337 | ||
338 | // TPC refit | |
339 | if(!(status & AliESDtrack::kTPCrefit)) return kFALSE; | |
340 | ||
341 | // Chi2 per TPC cluster | |
342 | Int_t nTPCclusters = d[i]->GetTPCNcls(); | |
343 | Float_t chi2perTPCcluster = d[i]->GetTPCchi2()/Float_t(nTPCclusters); | |
344 | if(chi2perTPCcluster > 4) return kFALSE; | |
345 | ||
346 | // TPC cluster ratio | |
347 | Float_t cRatioTPC = d[i]->GetTPCNclsF() > 0. ? static_cast<Float_t>(d[i]->GetTPCNcls())/static_cast<Float_t> (d[i]->GetTPCNclsF()) : 1.; | |
348 | if(cRatioTPC < 0.6) return kFALSE; | |
349 | ||
350 | // kinks | |
351 | if(d[i]->GetKinkIndex(0) != 0) return kFALSE; | |
352 | ||
353 | } | |
354 | ||
355 | return kTRUE; | |
356 | } | |
357 | //____________________________________________________________________ | |
358 | Bool_t AliESDv0KineCuts::CaseGamma(AliESDv0* const v0, Int_t &pdgV0, Int_t &pdgP, Int_t &pdgN) const | |
359 | { | |
360 | // | |
361 | // process the gamma conversion candidate | |
362 | // | |
363 | ||
364 | if(!v0) return kFALSE; | |
365 | ||
366 | AliVTrack* daughter[2]; | |
367 | Int_t pIndex = 0, nIndex = 0; | |
368 | ||
369 | Bool_t sign = CheckSigns(v0); | |
370 | if(sign){ | |
371 | pIndex = v0->GetPindex(); | |
372 | nIndex = v0->GetNindex(); | |
373 | } | |
374 | else{ | |
375 | pIndex = v0->GetNindex(); | |
376 | nIndex = v0->GetPindex(); | |
377 | } | |
378 | daughter[0] = dynamic_cast<AliVTrack *>(fEvent->GetTrack(pIndex)); | |
379 | daughter[1] = dynamic_cast<AliVTrack *>(fEvent->GetTrack(nIndex)); | |
380 | if(!daughter[0] || !daughter[1]) return kFALSE; | |
381 | ||
382 | AliKFParticle *kfMother = CreateMotherParticle(daughter[0], daughter[1], TMath::Abs(kElectron), TMath::Abs(kElectron)); | |
383 | if(!kfMother) return kFALSE; | |
384 | ||
385 | AliESDtrack* d[2]; | |
386 | d[0] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(pIndex)); | |
387 | d[1] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(nIndex)); | |
388 | ||
389 | Float_t iMass = v0->GetEffMass(0, 0); | |
390 | ||
391 | // cos pointing angle | |
392 | Double_t cosPoint = v0->GetV0CosineOfPointingAngle(); | |
393 | cosPoint = TMath::ACos(cosPoint); | |
394 | ||
395 | // DCA between daughters | |
396 | Double_t dca = v0->GetDcaV0Daughters(); | |
397 | ||
398 | // Production vertex | |
399 | Double_t x, y, z; | |
400 | v0->GetXYZ(x,y,z); | |
401 | Double_t r = TMath::Sqrt(x*x + y*y); | |
402 | ||
403 | Double_t xy[2]; | |
404 | Double_t r2 = -1.; | |
405 | if ( GetConvPosXY(d[0], d[1], xy) ){ | |
406 | r2 = TMath::Sqrt(xy[0]*xy[0] + xy[1]*xy[1]); | |
407 | } | |
408 | ||
409 | // psi pair | |
410 | Double_t psiPair = PsiPair(v0); | |
411 | ||
412 | // V0 chi2/ndf | |
413 | Double_t chi2ndf = kfMother->GetChi2()/kfMother->GetNDF(); | |
414 | ||
415 | if(kfMother) delete kfMother; | |
416 | ||
417 | // apply the cuts | |
418 | ||
419 | if(iMass > fGcutInvMass) return kFALSE; | |
420 | ||
421 | if(chi2ndf > fGcutChi2NDF) return kFALSE; | |
422 | ||
423 | if(cosPoint < fGcutCosPoint[0] || cosPoint > fGcutCosPoint[1]) return kFALSE; | |
424 | ||
425 | if(dca < fGcutDCA[0] || dca > fGcutDCA[1]) return kFALSE; | |
426 | ||
427 | if(r < fGcutVertexR[0] || r > fGcutVertexR[1]) return kFALSE; | |
428 | ||
429 | if(psiPair < fGcutPsiPair[0] || psiPair > fGcutPsiPair[1]) return kFALSE; | |
430 | ||
431 | // all cuts passed | |
432 | ||
433 | pdgV0 = 22; | |
434 | if(sign){ | |
435 | pdgP = -11; | |
436 | pdgN = 11; | |
437 | } | |
438 | else{ | |
439 | pdgP = 11; | |
440 | pdgN = -11; | |
441 | } | |
442 | ||
443 | return kTRUE; | |
444 | } | |
445 | //____________________________________________________________________ | |
446 | Bool_t AliESDv0KineCuts::CaseK0(AliESDv0* const v0, Int_t &pdgV0, Int_t &pdgP, Int_t &pdgN) const { | |
447 | // | |
448 | // process the K0 candidate | |
449 | // | |
450 | ||
451 | if(!v0) return kFALSE; | |
452 | ||
453 | AliVTrack* daughter[2]; | |
454 | Int_t pIndex = 0, nIndex = 0; | |
455 | Bool_t sign = CheckSigns(v0); | |
456 | if(sign){ | |
457 | pIndex = v0->GetPindex(); | |
458 | nIndex = v0->GetNindex(); | |
459 | } | |
460 | else{ | |
461 | pIndex = v0->GetNindex(); | |
462 | nIndex = v0->GetPindex(); | |
463 | } | |
464 | ||
465 | daughter[0] = dynamic_cast<AliVTrack *>(fEvent->GetTrack(pIndex)); | |
466 | daughter[1] = dynamic_cast<AliVTrack *>(fEvent->GetTrack(nIndex)); | |
467 | if(!daughter[0] || !daughter[1]) return kFALSE; | |
468 | ||
469 | AliKFParticle *kfMother = CreateMotherParticle(daughter[0], daughter[1], TMath::Abs(kPiPlus), TMath::Abs(kPiPlus)); | |
470 | if(!kfMother) return kFALSE; | |
471 | ||
472 | AliESDtrack* d[2]; | |
473 | d[0] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(pIndex)); | |
474 | d[1] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(nIndex)); | |
475 | ||
476 | Float_t iMass = v0->GetEffMass(2, 2); | |
477 | ||
478 | // cos pointing angle | |
479 | Double_t cosPoint = v0->GetV0CosineOfPointingAngle(); | |
480 | cosPoint = TMath::ACos(cosPoint); | |
481 | ||
482 | // DCA between daughters | |
483 | Double_t dca = v0->GetDcaV0Daughters(); | |
484 | ||
485 | // Production vertex | |
486 | Double_t x, y, z; | |
487 | v0->GetXYZ(x,y,z); | |
488 | ||
489 | Double_t r = TMath::Sqrt(x*x + y*y); | |
490 | ||
491 | // V0 chi2/ndf | |
492 | Double_t chi2ndf = kfMother->GetChi2()/kfMother->GetNDF(); | |
493 | ||
494 | if(kfMother) delete kfMother; | |
495 | ||
496 | // | |
497 | // apply the cuts | |
498 | // | |
499 | if(iMass < fK0cutInvMass[0] || iMass > fK0cutInvMass[1]) return kFALSE; | |
500 | ||
501 | if(chi2ndf > fK0cutChi2NDF) return kFALSE; | |
502 | ||
503 | if(cosPoint < fK0cutCosPoint[0] || cosPoint > fK0cutCosPoint[1]) return kFALSE; | |
504 | ||
505 | if(dca < fK0cutDCA[0] || dca > fK0cutDCA[1]) return kFALSE; | |
506 | ||
507 | if(r < fK0cutVertexR[0] || r > fK0cutVertexR[1]) return kFALSE; | |
508 | ||
509 | // all cuts passed | |
510 | pdgV0 = 310; | |
511 | if(sign){ | |
512 | pdgP = 211; | |
513 | pdgN = -211; | |
514 | } | |
515 | else{ | |
516 | pdgP = -211; | |
517 | pdgN = 211; | |
518 | } | |
519 | ||
520 | return kTRUE; | |
521 | } | |
522 | //____________________________________________________________________ | |
523 | Bool_t AliESDv0KineCuts::CaseLambda(AliESDv0* const v0, Int_t &pdgV0, Int_t &pdgP, Int_t &pdgN, Int_t id) const { | |
524 | // | |
525 | // process teh Lambda and Anti-Lambda candidate | |
526 | // | |
527 | ||
528 | if(!v0) return kFALSE; | |
529 | ||
530 | const Double_t cL0mass=TDatabasePDG::Instance()->GetParticle(kLambda0)->Mass(); // PDG lambda mass | |
531 | ||
532 | AliVTrack* daughter[2]; | |
533 | Int_t pIndex = 0, nIndex = 0; | |
534 | Float_t mMass[2] = {-1., -1.}; | |
535 | Bool_t sign = CheckSigns(v0); | |
536 | if(sign){ | |
537 | pIndex = v0->GetPindex(); | |
538 | nIndex = v0->GetNindex(); | |
539 | mMass[0] = v0->GetEffMass(4, 2); | |
540 | mMass[1] = v0->GetEffMass(2, 4); | |
541 | } | |
542 | else{ | |
543 | pIndex = v0->GetNindex(); | |
544 | nIndex = v0->GetPindex(); | |
545 | mMass[0] = v0->GetEffMass(2, 4); | |
546 | mMass[1] = v0->GetEffMass(4, 2); | |
547 | } | |
548 | ||
549 | daughter[0] = dynamic_cast<AliVTrack *>(fEvent->GetTrack(pIndex)); | |
550 | daughter[1] = dynamic_cast<AliVTrack *>(fEvent->GetTrack(nIndex)); | |
551 | if(!daughter[0] || !daughter[1]) return kFALSE; | |
552 | ||
553 | AliKFParticle *kfMother[2] = {0x0, 0x0}; | |
554 | // Lambda | |
555 | kfMother[0] = CreateMotherParticle(daughter[0], daughter[1], TMath::Abs(kProton), TMath::Abs(kPiPlus)); | |
556 | if(!kfMother[0]) return kFALSE; | |
557 | ||
558 | // Anti-Lambda | |
559 | kfMother[1] = CreateMotherParticle(daughter[0], daughter[1], TMath::Abs(kPiPlus), TMath::Abs(kProton)); | |
560 | if(!kfMother[1]) return kFALSE; | |
561 | ||
2942f542 | 562 | Float_t dMass[2] = {static_cast<Float_t>(TMath::Abs(mMass[0] - cL0mass)), static_cast<Float_t>(TMath::Abs(mMass[1] - cL0mass))}; |
a65a7e70 | 563 | |
564 | AliESDtrack* d[2]; | |
565 | d[0] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(pIndex)); | |
566 | d[1] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(nIndex)); | |
567 | if(!d[0] || !d[1]) return kFALSE; | |
568 | ||
2942f542 | 569 | Float_t p[2] = {static_cast<Float_t>(d[0]->GetP()), static_cast<Float_t>(d[1]->GetP())}; |
a65a7e70 | 570 | |
571 | // check the 3 lambda - antilambda variables | |
572 | Int_t check[2] = {-1, -1}; // 0 : lambda, 1 : antilambda | |
573 | // 1) momentum of the daughter particles - proton is expected to have higher momentum than pion | |
574 | check[0] = (p[0] > p[1]) ? 0 : 1; | |
575 | // 2) mass of the mother particle | |
576 | check[1] = (dMass[0] < dMass[1]) ? 0 : 1; | |
577 | ||
578 | // require positive correlation of (1) and (2) | |
579 | if(check[0] != check[1]){ | |
580 | if(kfMother[0]) delete kfMother[0]; | |
581 | if(kfMother[1]) delete kfMother[1]; | |
582 | return kFALSE; | |
583 | } | |
584 | ||
585 | // now that the check[0] == check[1] | |
586 | const Int_t type = check[0]; | |
587 | ||
588 | // require that the input armenteros preselection agree: | |
589 | if(type != id) return kFALSE; | |
590 | ||
591 | Float_t iMass =0.; | |
592 | if(sign){ | |
593 | iMass = (type == 0) ? v0->GetEffMass(4, 2) : v0->GetEffMass(2, 4); | |
594 | } | |
595 | else{ | |
596 | iMass = (type == 0) ? v0->GetEffMass(2, 4) : v0->GetEffMass(4, 2); | |
597 | } | |
598 | ||
599 | // cos pointing angle | |
600 | Double_t cosPoint = v0->GetV0CosineOfPointingAngle(); | |
601 | cosPoint = TMath::ACos(cosPoint); | |
602 | ||
603 | // DCA between daughters | |
604 | Double_t dca = v0->GetDcaV0Daughters(); | |
605 | ||
606 | // Production vertex | |
607 | Double_t x, y, z; | |
608 | v0->GetXYZ(x,y,z); | |
609 | Double_t r = TMath::Sqrt(x*x + y*y); | |
610 | ||
611 | // proton - pion indices | |
612 | Int_t ix[2] = {0, 1}; | |
613 | if(1 == type){ | |
614 | ix[0] = 1; | |
615 | ix[1] = 0; | |
616 | } | |
617 | ||
618 | // V0 chi2/ndf | |
619 | Double_t chi2ndf = kfMother[type]->GetChi2()/kfMother[type]->GetNDF(); | |
620 | ||
621 | if(kfMother[0]) delete kfMother[0]; | |
622 | if(kfMother[1]) delete kfMother[1]; | |
623 | ||
624 | // | |
625 | // apply the cuts | |
626 | // | |
627 | ||
628 | if(iMass < fLcutInvMass[0] || iMass > fLcutInvMass[1]) return kFALSE; | |
629 | ||
630 | if(chi2ndf > fLcutChi2NDF) return kFALSE; | |
631 | ||
632 | if(cosPoint < fLcutCosPoint[0] || cosPoint > fLcutCosPoint[1]) return kFALSE; | |
633 | ||
634 | if(dca < fLcutDCA[0] || dca > fLcutDCA[1]) return kFALSE; | |
635 | ||
636 | if(r < fLcutVertexR[0] || r > fLcutVertexR[1]) return kFALSE; | |
637 | ||
638 | // all cuts passed | |
639 | ||
640 | if(0 == type){ | |
641 | pdgV0 = 3122; | |
642 | if(sign){ | |
643 | pdgP = 2212; | |
644 | pdgN = -211; | |
645 | } | |
646 | else{ | |
647 | pdgP = -211; | |
648 | pdgN = 2212; | |
649 | } | |
650 | } | |
651 | else{ | |
652 | pdgV0 = -3122; | |
653 | if(sign){ | |
654 | pdgP = 211; | |
655 | pdgN = -2212; | |
656 | } | |
657 | else{ | |
658 | pdgP = -2212; | |
659 | pdgN = 211; | |
660 | } | |
661 | } | |
662 | ||
663 | return kTRUE; | |
664 | } | |
665 | //____________________________________________________________________ | |
666 | Bool_t AliESDv0KineCuts::V0CutsCommon(const AliESDv0 * const v0) const | |
667 | { | |
668 | // | |
669 | // V0 cuts common to all V0s | |
670 | // | |
671 | ||
672 | AliESDtrack* dN, *dP; | |
673 | ||
674 | dP = dynamic_cast<AliESDtrack *>(fEvent->GetTrack(v0->GetPindex())); | |
675 | dN = dynamic_cast<AliESDtrack *>(fEvent->GetTrack(v0->GetNindex())); | |
676 | ||
677 | if(!dN || !dP) return kFALSE; | |
678 | ||
679 | Int_t qP = dP->Charge(); | |
680 | Int_t qN = dN->Charge(); | |
681 | ||
682 | if((qP*qN) != -1) return kFALSE; | |
683 | ||
684 | return kTRUE; | |
685 | } | |
686 | //____________________________________________________________________ | |
687 | void AliESDv0KineCuts::Armenteros(AliESDv0* const v0, Float_t val[2]) const | |
688 | { | |
689 | // | |
690 | // computes the Armenteros variables for given V0 | |
691 | // fills the histogram | |
692 | // returns the values via "val" | |
693 | // | |
694 | ||
695 | Double_t mn[3] = {0,0,0}; | |
696 | Double_t mp[3] = {0,0,0}; | |
697 | Double_t mm[3] = {0,0,0}; | |
698 | ||
699 | if(CheckSigns(v0)){ | |
700 | v0->GetNPxPyPz(mn[0],mn[1],mn[2]); //reconstructed cartesian momentum components of negative daughter | |
701 | v0->GetPPxPyPz(mp[0],mp[1],mp[2]); //reconstructed cartesian momentum components of positive daughter | |
702 | } | |
703 | else{ | |
704 | v0->GetPPxPyPz(mn[0],mn[1],mn[2]); //reconstructed cartesian momentum components of negative daughter | |
705 | v0->GetNPxPyPz(mp[0],mp[1],mp[2]); //reconstructed cartesian momentum components of positive daughter | |
706 | } | |
707 | v0->GetPxPyPz(mm[0],mm[1],mm[2]); //reconstructed cartesian momentum components of mother | |
708 | ||
709 | TVector3 vecN(mn[0],mn[1],mn[2]); | |
710 | TVector3 vecP(mp[0],mp[1],mp[2]); | |
711 | TVector3 vecM(mm[0],mm[1],mm[2]); | |
712 | ||
713 | Double_t thetaP = acos((vecP * vecM)/(vecP.Mag() * vecM.Mag())); | |
714 | Double_t thetaN = acos((vecN * vecM)/(vecN.Mag() * vecM.Mag())); | |
715 | ||
716 | Double_t alfa = ((vecP.Mag())*cos(thetaP)-(vecN.Mag())*cos(thetaN))/ | |
717 | ((vecP.Mag())*cos(thetaP)+(vecN.Mag())*cos(thetaN)) ; | |
718 | Double_t qt = vecP.Mag()*sin(thetaP); | |
719 | ||
720 | val[0] = alfa; | |
721 | val[1] = qt; | |
722 | } | |
723 | //____________________________________________________________________ | |
724 | Bool_t AliESDv0KineCuts::CheckSigns(AliESDv0* const v0) const | |
725 | { | |
726 | // | |
727 | // check wheter the sign was correctly applied to | |
728 | // V0 daughter tracks | |
729 | // | |
730 | ||
731 | Bool_t correct = kFALSE; | |
732 | ||
733 | Int_t pIndex = 0, nIndex = 0; | |
734 | pIndex = v0->GetPindex(); | |
735 | nIndex = v0->GetNindex(); | |
736 | ||
737 | AliESDtrack* d[2]; | |
738 | d[0] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(pIndex)); | |
739 | d[1] = dynamic_cast<AliESDtrack*>(fEvent->GetTrack(nIndex)); | |
740 | ||
741 | Int_t sign[2]; | |
742 | sign[0] = (int)d[0]->GetSign(); | |
743 | sign[1] = (int)d[1]->GetSign(); | |
744 | ||
745 | if(-1 == sign[0] && 1 == sign[1]){ | |
746 | correct = kFALSE; | |
747 | } | |
748 | else{ | |
749 | correct = kTRUE; | |
750 | } | |
751 | ||
752 | return correct; | |
753 | } | |
754 | //________________________________________________________________ | |
755 | Double_t AliESDv0KineCuts::PsiPair(AliESDv0* const v0) const | |
756 | { | |
757 | // | |
758 | // Angle between daughter momentum plane and plane | |
759 | // | |
760 | ||
761 | if(!fEvent) return -1.; | |
762 | ||
763 | Float_t magField = fEvent->GetMagneticField(); | |
764 | ||
765 | Int_t pIndex = -1; | |
766 | Int_t nIndex = -1; | |
767 | if(CheckSigns(v0)){ | |
768 | pIndex = v0->GetPindex(); | |
769 | nIndex = v0->GetNindex(); | |
770 | } | |
771 | else{ | |
772 | pIndex = v0->GetNindex(); | |
773 | nIndex = v0->GetPindex(); | |
774 | } | |
775 | ||
776 | ||
777 | AliESDtrack* daughter[2]; | |
778 | ||
779 | daughter[0] = dynamic_cast<AliESDtrack *>(fEvent->GetTrack(pIndex)); | |
780 | daughter[1] = dynamic_cast<AliESDtrack *>(fEvent->GetTrack(nIndex)); | |
781 | ||
782 | Double_t x, y, z; | |
783 | v0->GetXYZ(x,y,z);//Reconstructed coordinates of V0; to be replaced by Markus Rammler's method in case of conversions! | |
784 | ||
785 | Double_t mn[3] = {0,0,0}; | |
786 | Double_t mp[3] = {0,0,0}; | |
787 | ||
788 | ||
789 | v0->GetNPxPyPz(mn[0],mn[1],mn[2]);//reconstructed cartesian momentum components of negative daughter; | |
790 | v0->GetPPxPyPz(mp[0],mp[1],mp[2]);//reconstructed cartesian momentum components of positive daughter; | |
791 | ||
792 | ||
793 | Double_t deltat = 1.; | |
794 | deltat = TMath::ATan(mp[2]/(TMath::Sqrt(mp[0]*mp[0] + mp[1]*mp[1])+1.e-13)) - TMath::ATan(mn[2]/(TMath::Sqrt(mn[0]*mn[0] + mn[1]*mn[1])+1.e-13));//difference of angles of the two daughter tracks with z-axis | |
795 | ||
796 | Double_t radiussum = TMath::Sqrt(x*x + y*y) + 50;//radius to which tracks shall be propagated | |
797 | ||
798 | Double_t momPosProp[3]; | |
799 | Double_t momNegProp[3]; | |
800 | ||
801 | AliExternalTrackParam pt(*daughter[0]), nt(*daughter[1]); | |
802 | ||
803 | Double_t psiPair = 4.; | |
804 | ||
805 | if(nt.PropagateTo(radiussum,magField) == 0)//propagate tracks to the outside | |
806 | psiPair = -5.; | |
807 | if(pt.PropagateTo(radiussum,magField) == 0) | |
808 | psiPair = -5.; | |
809 | pt.GetPxPyPz(momPosProp);//Get momentum vectors of tracks after propagation | |
810 | nt.GetPxPyPz(momNegProp); | |
811 | ||
812 | Double_t pEle = | |
813 | TMath::Sqrt(momNegProp[0]*momNegProp[0]+momNegProp[1]*momNegProp[1]+momNegProp[2]*momNegProp[2]);//absolute momentum value of negative daughter | |
814 | Double_t pPos = | |
815 | TMath::Sqrt(momPosProp[0]*momPosProp[0]+momPosProp[1]*momPosProp[1]+momPosProp[2]*momPosProp[2]);//absolute momentum value of positive daughter | |
816 | ||
817 | Double_t scalarproduct = | |
818 | momPosProp[0]*momNegProp[0]+momPosProp[1]*momNegProp[1]+momPosProp[2]*momNegProp[2];//scalar product of propagated positive and negative daughters' momenta | |
819 | ||
820 | Double_t chipair = TMath::ACos(scalarproduct/(pEle*pPos));//Angle between propagated daughter tracks | |
821 | ||
822 | psiPair = TMath::Abs(TMath::ASin(deltat/chipair)); | |
823 | ||
824 | return psiPair; | |
825 | } | |
826 | //___________________________________________________________________ | |
827 | Bool_t AliESDv0KineCuts::GetConvPosXY(AliESDtrack * const ptrack, AliESDtrack * const ntrack, Double_t convpos[2]) const | |
828 | { | |
829 | // | |
830 | // recalculate the gamma conversion XY postition | |
831 | // | |
832 | ||
833 | const Double_t b = fEvent->GetMagneticField(); | |
834 | ||
835 | Double_t helixcenterpos[2]; | |
836 | GetHelixCenter(ptrack,b,ptrack->Charge(),helixcenterpos); | |
837 | ||
838 | Double_t helixcenterneg[2]; | |
839 | GetHelixCenter(ntrack,b,ntrack->Charge(),helixcenterneg); | |
840 | ||
841 | Double_t poshelix[6]; | |
842 | ptrack->GetHelixParameters(poshelix,b); | |
843 | Double_t posradius = TMath::Abs(1./poshelix[4]); | |
844 | ||
845 | Double_t neghelix[6]; | |
846 | ntrack->GetHelixParameters(neghelix,b); | |
847 | Double_t negradius = TMath::Abs(1./neghelix[4]); | |
848 | ||
849 | Double_t xpos = helixcenterpos[0]; | |
850 | Double_t ypos = helixcenterpos[1]; | |
851 | Double_t xneg = helixcenterneg[0]; | |
852 | Double_t yneg = helixcenterneg[1]; | |
853 | ||
854 | convpos[0] = (xpos*negradius + xneg*posradius)/(negradius+posradius); | |
855 | convpos[1] = (ypos*negradius+ yneg*posradius)/(negradius+posradius); | |
856 | ||
857 | return 1; | |
858 | } | |
859 | //___________________________________________________________________ | |
860 | Bool_t AliESDv0KineCuts::GetHelixCenter(AliESDtrack * const track, Double_t b,Int_t charge, Double_t center[2]) const | |
861 | { | |
862 | // | |
863 | // computes the center of the track helix | |
864 | // | |
865 | ||
866 | Double_t pi = TMath::Pi(); | |
867 | ||
868 | Double_t helix[6]; | |
869 | track->GetHelixParameters(helix,b); | |
870 | ||
871 | Double_t xpos = helix[5]; | |
872 | Double_t ypos = helix[0]; | |
873 | Double_t radius = TMath::Abs(1./helix[4]); | |
874 | Double_t phi = helix[2]; | |
875 | ||
876 | if(phi < 0){ | |
877 | phi = phi + 2*pi; | |
878 | } | |
879 | ||
880 | phi -= pi/2.; | |
881 | Double_t xpoint = radius * TMath::Cos(phi); | |
882 | Double_t ypoint = radius * TMath::Sin(phi); | |
883 | ||
884 | if(b<0){ | |
885 | if(charge > 0){ | |
886 | xpoint = - xpoint; | |
887 | ypoint = - ypoint; | |
888 | } | |
889 | /* avoid self assignment | |
890 | if(charge < 0){ | |
891 | xpoint = xpoint; | |
892 | ypoint = ypoint; | |
893 | } | |
894 | */ | |
895 | } | |
896 | if(b>0){ | |
897 | /* avoid self assignment | |
898 | if(charge > 0){ | |
899 | xpoint = xpoint; | |
900 | ypoint = ypoint; | |
901 | } | |
902 | */ | |
903 | if(charge < 0){ | |
904 | xpoint = - xpoint; | |
905 | ypoint = - ypoint; | |
906 | } | |
907 | } | |
908 | center[0] = xpos + xpoint; | |
909 | center[1] = ypos + ypoint; | |
910 | ||
911 | return 1; | |
912 | } | |
913 | //___________________________________________________________________ | |
914 | AliKFParticle *AliESDv0KineCuts::CreateMotherParticle(const AliVTrack* const pdaughter, const AliVTrack* const ndaughter, Int_t pspec, Int_t nspec) const | |
915 | { | |
916 | // | |
917 | // Creates a mother particle | |
918 | // | |
919 | AliKFParticle pkfdaughter(*pdaughter, pspec); | |
920 | AliKFParticle nkfdaughter(*ndaughter, nspec); | |
921 | ||
922 | ||
923 | // Create the mother particle | |
924 | AliKFParticle *m = new AliKFParticle(pkfdaughter, nkfdaughter); | |
925 | m->SetField(fEvent->GetMagneticField()); | |
926 | if(TMath::Abs(kElectron) == pspec && TMath::Abs(kElectron) == nspec) m->SetMassConstraint(0, 0.001); | |
927 | else if(TMath::Abs(kPiPlus) == pspec && TMath::Abs(kPiPlus) == nspec) m->SetMassConstraint(TDatabasePDG::Instance()->GetParticle(kK0Short)->Mass(), 0.); | |
928 | else if(TMath::Abs(kProton) == pspec && TMath::Abs(kPiPlus) == nspec) m->SetMassConstraint(TDatabasePDG::Instance()->GetParticle(kLambda0)->Mass(), 0.); | |
929 | else if(TMath::Abs(kPiPlus) == pspec && TMath::Abs(kProton) == nspec) m->SetMassConstraint(TDatabasePDG::Instance()->GetParticle(kLambda0)->Mass(), 0.); | |
930 | else{ | |
931 | AliErrorClass("Wrong daughter ID - mass constraint can not be set"); | |
932 | } | |
933 | ||
934 | AliKFVertex improvedVertex = *fPrimaryVertex; | |
935 | improvedVertex += *m; | |
936 | m->SetProductionVertex(improvedVertex); | |
937 | ||
938 | // update 15/06/2010 | |
939 | // mother particle will not be added to primary vertex but only to its copy | |
940 | // as this confilcts with calling | |
941 | // m->SetPrimaryVertex() function and | |
942 | // subsequently removing the mother particle afterwards | |
943 | // Source: Sergey Gorbunov | |
944 | ||
945 | return m; | |
946 | } | |
947 | //____________________________________________________________________ | |
948 | void AliESDv0KineCuts::SetEvent(AliESDEvent* const event){ | |
949 | // | |
950 | // direct setter of ESD event | |
951 | // | |
952 | fEvent = event; | |
953 | if(!fEvent){ | |
954 | AliErrorClass("Invalid input event pointer"); | |
955 | return; | |
956 | } | |
957 | if (fUseExternalVertex) return; | |
958 | else{ | |
959 | if(fPrimaryVertex && fDeleteVertex){ | |
960 | delete fPrimaryVertex; | |
961 | fPrimaryVertex=0x0; | |
962 | } | |
963 | fPrimaryVertex = new AliKFVertex(*(fEvent->GetPrimaryVertex())); | |
964 | fDeleteVertex=kTRUE; | |
965 | } | |
966 | ||
967 | ||
968 | ||
969 | } | |
970 | //____________________________________________________________________ | |
971 | void AliESDv0KineCuts::SetEvent(AliVEvent* const event){ | |
972 | // | |
973 | // direct setter of ESD event | |
974 | // | |
975 | ||
976 | fEvent = dynamic_cast<AliESDEvent*>(event); | |
977 | if(!fEvent){ | |
978 | AliErrorClass("Invalid input event pointer"); | |
979 | return; | |
980 | } | |
981 | ||
982 | if (fUseExternalVertex) return; | |
983 | else{ | |
984 | if(fPrimaryVertex && fDeleteVertex){ | |
985 | delete fPrimaryVertex; | |
986 | fPrimaryVertex=0x0; | |
987 | } | |
988 | fPrimaryVertex = new AliKFVertex(*(fEvent->GetPrimaryVertex())); | |
989 | fDeleteVertex=kTRUE; | |
990 | } | |
991 | } | |
992 | ||
993 | ||
994 | //________________________________________________________________ | |
995 | void AliESDv0KineCuts::UseExternalVertex(Bool_t use_external){ | |
996 | // | |
997 | // Reenable primary Vertex from ESD event | |
998 | // | |
999 | if (use_external) fUseExternalVertex =kTRUE; | |
1000 | else fUseExternalVertex =kFALSE; | |
1001 | } | |
1002 | ||
1003 | ||
1004 | ||
1005 | ||
1006 | //________________________________________________________________ | |
1007 | void AliESDv0KineCuts::SetPrimaryVertex(AliKFVertex* const v){ | |
1008 | // | |
1009 | // set the primary vertex of the event | |
1010 | // | |
1011 | if(fPrimaryVertex && fDeleteVertex){ | |
1012 | delete fPrimaryVertex; | |
1013 | fPrimaryVertex =0x0; | |
1014 | fDeleteVertex = kFALSE; | |
1015 | } | |
1016 | fUseExternalVertex=kTRUE; | |
1017 | fPrimaryVertex = v; // set primary Vertex | |
1018 | if(!fPrimaryVertex){ | |
1019 | AliErrorClass("Failed to initialize the primary vertex"); | |
1020 | return; | |
1021 | } | |
1022 | } | |
1023 | //___________________________________________________________________ | |
1024 | void AliESDv0KineCuts::SetMode(Int_t mode, Int_t type){ | |
1025 | // | |
1026 | // this function allows the user to select (prior running the 'ProcessV0' function) | |
1027 | // to select different approaches to V0 selection - the 'mode' | |
1028 | // - and - | |
1029 | // different systems (pp, PbPb) - 'type' | |
1030 | // | |
1031 | // To see the cut values for different modes please refer to the | |
1032 | // function SetCuts() | |
1033 | // | |
1034 | // Important notice: based on the parameters particular sets of cuts will | |
1035 | // be activated for teh V0 selection. If some additional changes to single | |
1036 | // cuts are needed please us the SetXXXcut function (see the header file) | |
1037 | // | |
1038 | ||
1039 | switch(mode){ | |
1040 | case kPurity: | |
1041 | fMode = kPurity; // used to obtain highest purity possible - the efficiency may be low | |
1042 | break; | |
1043 | case kEffGamma: | |
1044 | fMode = kEffGamma; // used to obtain highes efficiency possible - the purity may be worse | |
1045 | break; | |
1046 | default: | |
1047 | AliError("V0 selection mode not recognozed, setting 'kPurity'"); | |
1048 | fMode = kPurity; | |
1049 | } | |
1050 | ||
1051 | switch(type){ | |
1052 | case kPP: | |
1053 | fType = kPP; // cuts optimized for low multiplicity | |
1054 | break; | |
1055 | case kPbPb: | |
1056 | fType = kPbPb; // cuts optimized for high multiplicity | |
1057 | break; | |
1058 | } | |
1059 | ||
1060 | // setup the cut values for selected mode & type | |
1061 | SetCuts(); | |
1062 | ||
1063 | } | |
1064 | //___________________________________________________________________ | |
1065 | void AliESDv0KineCuts::SetMode(Int_t mode, const char* type){ | |
1066 | // | |
1067 | // overloaded function - please see above | |
1068 | // | |
1069 | ||
1070 | Int_t t = -1; | |
1071 | ||
1072 | if(!strcmp("pp", type)) t = kPP; | |
1073 | else if(!(strcmp("PbPb", type))) t = kPbPb; | |
1074 | else{ | |
1075 | AliError("data type not recognized, setting 'pp'"); | |
1076 | t = kPP; | |
1077 | } | |
1078 | ||
1079 | SetMode(mode, t); | |
1080 | ||
1081 | } | |
1082 | //___________________________________________________________________ | |
1083 | void AliESDv0KineCuts::SetCuts(){ | |
1084 | // | |
1085 | // this funciton sets the default cut values based on the selected | |
1086 | // fMode and fType. | |
1087 | // please note that only the cuts that have different values than the default | |
1088 | // cuts are updated here | |
1089 | // | |
1090 | ||
1091 | // last update: 14/02/2011 | |
1092 | // as a very preliminary - the only change to default cuts is to apply | |
1093 | // less restricting gamma conversion selection in PreselectV0() function | |
1094 | ||
1095 | ||
1096 | ||
1097 | } |